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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cpm <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P502227 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/26/05 14 14 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source °/"REC RPD <br /> Analyte Result Limit Units Level Result "/•REC IAMIts RPD Limit Notes <br /> Batch 5020309-EPA 5030E waters/EPA 8260B <br /> Blank(5020309-BLK1) Prepared&Analyzed 02/24/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> • Surrogate Dibromofluoromethane 609 500 122 84-121 <br /> Surrogate 1,2-Dichloroethane-d4 667 500 133 74-135 <br /> Surrogate Toluene-d8 562 5 00 112 84-119 <br /> Surrogate 4-Bromofluorobenzene 537 500 107 86-119 <br /> Laboratory Control Sample(5020309-BS1) Prepared&Analyzed 02/24/05 <br /> Tert-amyl methyl ether 535 1 0 ugll 500 107 78-117 <br /> Benzene 522 0 50 500 104 81-118 <br /> Tert-butyl alcohol 108 20 100 108 60-147 <br /> Di-isopropyl ether 643 1 0 500 129 70-125 HL <br /> 1,2-Dibromoethane(EDB) 5 12 050 500 102 85-125 <br /> 1,2-Dichloroethane 6 14 050 500 I23 77-126 <br /> Ethanol 115 100 100 115 55-200 <br /> Ethylbenzene 459 050 500 92 89-122 <br /> Ethyl tert-butyl ether 600 10 500 120 71-120 <br /> Methyl tert-butyl ether 616 0 50 500 123 70-122 HL <br /> Toluene 479 050 500 96 84-119 <br /> Xylenes(total) 13 9 0 50 150 93 86-132 <br /> Surrogate Dtbromofluoromethane 610 5 00 122 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 614 300 123 74-135 <br /> Surrogate Toluene d8 552 Soo 110 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 73 500 115 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> • This analytical report must be reproduced in its entirety <br /> Page 14 of 18 <br />